Toothache is an extremely common problem that can range from mild discomfort to severe, excruciating pain. It’s estimated that 5-10% of the global population suffers from severe toothache at any given time. Many people have experienced temporary relief from toothache pain simply by holding cold water or ice in the mouth. But what exactly is happening when this simple trick seems to alleviate tooth discomfort?

In this detailed article, we’ll first cover the various causes and biology of toothache pain. We’ll then explore the science behind using water to manage toothache, looking at how it impacts nerve signaling and blood flow. We’ll discuss the duration of pain relief, proper technique, and when it’s crucial to see a dentist instead. By the end, you’ll understand the mechanisms behind this free, readily available remedy for tooth pain.

The Causes and Biology of Toothache

The Causes and Biology of Toothache

Before understanding how water helps toothache, it’s useful to first understand what causes it and the anatomy involved. Let’s look at the common sources of tooth pain and the nerves that sense it.

Main Causes of Toothache

There are several potential causes of toothache, including:

  • Tooth decay (dental caries) – This is the most common source of toothache. It involves destruction of the hard, outer enamel layer of the tooth and deeper dentin layer underneath. Decay allows bacteria like Streptococcus mutans to enter and infect the inner soft pulp tissue, leading to inflammation and pain.
  • Dental abscess – An abscess is a pocket of pus caused by a bacterial infection of the dental pulp. Abscesses cause throbbing pain as pus builds up inside the tooth and pressure mounts on the nerves. The infection can spread to surrounding gum and bone tissue.
  • Damaged fillings – Over time, dental fillings can weaken or deteriorate, allowing bacteria, cold, or sugars to seep in and irritate the sensitive pulp. This causes pain when eating or drinking cold or sweet foods.
  • Cracked or broken teeth – Fractures in the teeth can expose the inner dentin and pulp to external stimuli like bacteria, air, and fluids. This irritation triggers pain. Cracks can occur from injury, grinding, or deteriorating dental work.
  • Bruxism – Forceful grinding or clenching of teeth, often during sleep, places intense pressure on the teeth. This can fracture enamel, wear down teeth, and inflame nerves. It’s a very common source of toothache.
  • Sensitive teeth – Wearing down of enamel from acid, genetics, or aggressive brushing exposes the dentin, which contains tunnels to the pulp. This causes severe pain from hot, cold, or sweet stimuli. Receding gums also remove protection of dentin.

Dental Anatomy and Nerves Involved

To understand how holding water helps toothaches, it’s important to understand the nerves and anatomy involved:

  • The pulp is the soft connective tissue inside each tooth containing nerves, blood vessels, and connective tissue. It senses hot, cold, pressure, and damage.
  • The pulp chamber is in the crown (visible part) of the tooth. It extends down through the root canals and out the tooth root tip.
  • Nerves enter the root canal through a small opening at the tip of the root and extend up into the pulp chamber.
  • These dental nerves are branches of the trigeminal nerve, which carries sensations from the face and mouth to the brain.
  • Inflammation or damage to the pulp activates nociceptors, pain-sensing nerve fibers that trigger signals.
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So essentially, toothache results from irritation of the dental pulp and activation of nociceptors. Holding cold water can temporarily calm these pain pathways.

How Holding Cold Water Alleviates Toothache

There are several ways that holding cold water or ice in the mouth seems to temporarily relieve toothache pain:

1. Cold numbs nerve endings

  • The cold temperature from the water or ice partially numbs pain-sensing nerves in the pulp and inner dentin layers of the tooth.
  • Similar to applying ice packs to injured areas, the cold reduces nerve impulses by slowing the movement of sodium ions across nerve cell membranes in the tooth.
  • This numbing effect decreases the tooth’s sensitivity to stimuli and inhibits pain signals from reaching the trigeminal nerve and brain.

2. Light pressure on gums

  • Swishing cold water around the mouth creates some pressure on the gums surrounding the painful tooth.
  • This stimulation activates touch receptors and mechanoreceptors that can temporarily override or block pain signals being sent from the tooth.
  • It serves as a counter-irritation that interferes with the perception of toothache.

3. Vasoconstriction reduces inflammation

  • The cold temperature causes vasoconstriction, which is shrinking of the blood vessels in the pulp and surrounding gum tissues.
  • Constriction reduces blood flow to the area, thereby limiting fluid buildup, swelling, inflammatory chemicals, and pressure on nociceptors.
  • This reduction in inflammation and nociceptor stimulation means fewer pain signals.

In summary, the cold, pressure, and vasoconstriction work together to briefly inhibit dental nerve signaling to the brain, providing temporary relief.

Duration of Pain Relief from Water

Duration of Pain Relief from Water

While the pain relief effect can seem almost instant, how long does it actually last? Here’s an overview:

  • The pain-blocking effect is often short-term, typically providing relief for just minutes up to an hour at most.
  • The numbness wears off within 5-10 minutes as the chilled tissues warm again back to body temperature.
  • Vasoconstriction is not maintained for long. Blood flow and inflammation of the pulp resumes.
  • Nociceptors accommodate to the cold and pressure over time and revert back to transmitting more pain signals.
  • Neurochemicals involved in pain sensation like Substance P start being produced again.

So the duration is relatively brief and temporary. The effect slowly fades over minutes as normal nerve function returns. This is why the pain relief must be repeated by using more cold water.

Limitations of Water for Toothache Relief

While drinking cold water can provide transient relief, it has several limitations:

  • It only offers temporary, not long-lasting pain relief. The underlying cause remains untreated.
  • It may not help severe tooth pain that has progressed, such as from infections or abscesses.
  • Pain can often return even worse once the numbing effect wears off after minutes.
  • For some people, thermal sensitivity from hot or cold water may further aggravate the tooth pain.
  • Swishing vigorous water can sometimes damage weakened teeth or existing fillings.
  • It does not prevent the condition worsening over time without proper dental treatment.
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So while the effect can provide respite from mild discomfort, water or ice alone should not be considered an effective cure or substitute for dental diagnosis and care when needed.

Effectiveness Depends on Water Temperature

Not all water temperatures alleviate toothache equally. Here is an overview of how the pain-relieving effectiveness compares:

Water Temperature Effectiveness for Toothache
Ice water Very effective – Provides the greatest degree of numbness and vasoconstriction for nerve blocking
Cold tap water Moderately effective – Cools tissues and provides some numbing, but less extreme than ice water
Room temperature water Minimally effective – Little to no numbing or vasoconstriction effect compared to colder water
Warm water Not effective – Can increase blood flow and inflammation, potentially worsening pain

The colder the water, the more it cools the inner tooth tissues and numbs nociceptors to block pain signaling. Ice water is ideal, but even cold tap water can offer mild to moderate relief. Warm or hot water does not help toothache.

Proper Technique for Using Water

Proper Technique for Using Water

To maximize the temporary pain-relieving effect from water, follow these tips:

  • Use the coldest water possible – Add ice cubes if available to make ice water.
  • Take a mouthful of the cold water and hold it in contact with the side of the achy tooth.
  • Swish the water back and forth around the tooth and apply light pressure with the water.
  • Aim the jet of water from swishing directly at the painful spot to target it.
  • Hold the water on the tooth for at least 30 seconds to 1 minute before spitting it out.
  • Repeat the process several times for the longest duration of effect.

Proper direction and pressure of the water matters. Try swishing from different angles to access the problematic area.

When to Seek Dental Care Instead

While cold water can provide temporary toothache relief, it’s still crucial to see a dentist promptly if you experience:

  • Toothache or sensitivity lasting more than 1-2 days without relief from cold water
  • Severe tooth pain that worsens over time rather than being soothed by water
  • Swelling in the cheek, gums, or neck area along with tooth pain
  • Tooth fracture, injury, or visible pulp exposure
  • Fever, ear pain, sinus pain, or facial numbness with toothache

These signs can indicate a dental abscess, infection, or other problem needing immediate treatment beyond just symptom relief. Though inconvenient, it’s best not to delay necessary dental care. An examination can determine if the pulp is damaged or teeth need extraction.

Why Does Water Work for Some Types of Tooth Pain Better Than Others?

The effectiveness of water for toothache relief depends partly on the underlying cause:

Cause of Pain Effectiveness of Water Reasoning
Dental caries Highly effective Cold numbs active inflammation in decayed pulp
Abscess Less effective Severe inflammation is harder to treat with just cold
Cracked tooth Moderately effective Cold calms exposed pulp but doesn’t fix fracture
Bruxism Effective for soreness Numbs aggravated nerves from grinding
Sensitive teeth Usually not effective Exposed dentin is irritated further by temperature changes
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For mild to moderate inflammation from decay or grinding, water can provide decent relief. But for cracked teeth or severe infections, it cannot treat the underlying problem.

The Science Behind Pain Relief from Cold Water

The Science Behind Pain Relief from Cold Water

Let’s take a deeper scientific look at the mechanisms behind how cold water alleviates toothache:

  • The cold reduces nerve conduction velocity by slowing ion transport that propagates nerve signals.
  • It activates TRPA1 channels in dental nociceptors which mediate the numbing effect.
  • Lower temperatures cause depolarization of nerve cell membranes, making it harder for action potentials to generate.
  • Cold inhibits release of proinflammatory neuropeptides like Substance P from activated nerves.
  • It stimulates descending nociceptive pathways in the brain that block pain perception.
  • Vasoconstriction reduces prostaglandin release, levels of bradykinin, and other inflammatory mediators.

So in various ways, cold interferes with pain signal generation and transmission, providing rapid but short-term relief.


In summary, holding cold water or ice against aching teeth and oral tissues can provide quick, temporary relief for mild to moderate toothache pain. The cold reduces nerve conduction while pressure and vasoconstriction limit inflammation. However, the effect only lasts for minutes before wearing off. While it can temporarily soothe discomfort, persistent or worsening toothache warrants dental evaluation and treatment rather than just home remedies. With an understanding of the science involved, cold water can be used as a convenient way to gain respite from dental pain when needed. Just be sure not to neglect proper dental care for any ongoing problems.

Key Summary Points

  • Toothache results from inflammation or damage to the tooth pulp containing sensitive nerves.
  • Holding very cold water or ice numbs nerves, creates counter-pressure, and constricts blood vessels.
  • This blocks pain signals providing temporary relief for mild to moderate toothaches.
  • The effect wears off within minutes as tissues re-warm and inflammation resumes.
  • Proper technique involves targeting the painful spot for 30+ seconds.
  • Though it temporarily alleviates pain, persistent toothaches still warrant dental treatment.
  • Severe pain, swelling, or other concerning symptoms require prompt dental care.

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